Bicycle.



Patented Nov. 4,1902.

J. w. MANSTER.

8 l C Y C L E.

(Application filed May 15, 1902.)

(mi Model.)

INV'BNTOR.

iINrrnen TATES 'PATENT OFFICE.

JAMES WILLIAM MASTER, OF SAN DIEGO, CALIFORNIA, ASSIGNOR OF ONE- HALF TO CHARLES B, RICHARDS, OF SAN DIEGO, CALIFORNIA.

BICYCLE.

SPECIFICATION forming part of Letters Patent No. 712,698, dated November 4, 1902.

7 Application filed May 15,1902. Serial No. 107,494. (1% model.)

To aZZ whom it may concern: ing 14. This sleeve 4 is provided with a Be it known that I, JAMES WILLIAM MAsgeared sector 15, which is engaged by a rack TER, of San Diego, county of San Diego, and 16. This rack is provided with an elongated State of California, haveinvented certain new extension-bar 17, having a handle 18 for the 5 and useful Improvements in Bicycles; and I purpose of rotating or oscillating the sleeve do hereby declare the following to be a full 4 alternately in either direction. This bar 17 and clear description thereof. is shown extending up through and mortised My invention relates to vehicles. in the bearing 14 outside the seat-post tube The object of my invention is to provide a 19. It may, however, pass up through the no rotary side-shaft driving mechanism with a seat-post, and the handle 18 may project variable-speed device, and in the present intherefrom in any way, so as to be convenstance I have applied my improvements to iently operated by the rider. 20 is a spring what are termed in the trade ohainless bidevice adapted to normally rest in a notch 21 cycles. It is obvious, however, that my inon the rod 17 for the purpose of holding the 15 vention may be applied to any kind of a verod in position after the sleeve4 has been adhicle or velocipede for which it maybe found 'justed. By moving the rack-bar in one disuitable. rection the sleeve 4 is moved to the right For the above purpose my invention conthrough the threaded connection-Maud 13 sists in the following construction and com-" and the gear 2 is thrown into mesh with the 20 bination of parts, the details of which will gear 11 of the righthand rotatable shaft 6. 7o first be fully described and the features of This adjustmentis suitable for speed on level novelty then set forth and claimed. roads or downgrade. By moving the rack 16 Figure 1 is a side elevation of abicycle emin the opposite direction the threads 12 and bodying my invention. Fig. 2 is a horizon- 13 throw the diiferential gears 2 3 toward the 25 tal longitudinal section, on an enlarged scale, left side of the frame and cause the gear 3 to from the crank-shaft to the rear-wheel axle. mesh with the gear 11 of the left-hand shaft Fig. 3 is a horizontal section of a detail of the 6, thereby varying the speed to what is known crank-shaft. Fig. 4 is a side elevation of as a low gear, suitable for hill-climbing parts of the frame and partial transverse secand the like. 30 tion of the crank-shaft. It will be understood that the proportions In the drawings is shown a diamond-frame of the gears shown in this instance are merely bicycle of the chainless type with rotary side illustrative and that any suitable and pracimpelling-shafts. The crank-shaft 1 is protic-a1 relative proportions Imay be employed. vided with differential bevel-gears 2 3. These The sector-gear 15 is shown elongated in Fig. 55 gears are preferably carried upon a sleeve 4, 3 to permit it to slide along the rack-bar 16 which is splined to the shaft 1, so as to have during the change of speed from a high to a a sliding reciprocating movement upon the lowgear. shaft. I provide the rear horizontal fork 5 The bicycle may be provided with dustwith a rotatableside shaft 6 in each tube of proofcasings of any type, one form being 40 the fork. The rear shaft 7carries upon either shown in the drawings. The wheel is to be side of the rearwheel 8 differential bevelprovided with the usual ball-bearings and gears 9. These gears 9 mesh with the differother appurtenances usually carried by a ential gears 10, carried by the rotatable side. first-class machine. shafts 6. The forward ends of the side shafts What I claim as new, and desire to secure 45 6 are each provided with a bevel-gear 11, arby Letters Patent, isranged to alternately mesh with the differ- In a bicycle, or a like vehicle, the combi ential gears 2 3. The crank-shaft sleeve 4 nation ofa drive-wheel, differential gears carcarries a thread or worm 12, which is adapted ried upon each side of the drive-wheel, a roto engage a similar interior thread or worm tatable side shaft upon each side of the drive- 50 13, provided in the forged or cast box or bearwheel, differential gears carried upon both ends of the rotatable side shafts, a crankwith the rack for alternately oscillating the IQ shaft, a sleeve carrying differential gears sleeve and changing the speed of the gears. adapted to alternately engage the gears of In testimony whereof I have affixed my sigboth rotatable side shafts, a gear connection nature in the presence of two witnesses.

5 between the sleeve and the bearin s for reciprocating the (lilferential gears, bzarings in JAMES WILLIAM MASTER which the sleeve reciprocates, a sector carried \Vitnesses: by the reciprocating sleeve, a rack engaging WV. A. SLOANE, the sector on the sleeve, and a rod connecting M. A. LUCE. 

